SGS Thomson Microelectronics 74AC280 Datasheet

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74AC280

9 BIT PARITY GENERATOR

■ HIGHSPEED:t

■

LOW POWER DISSIPATION:
I

=4 µA (MAX.)at TA=25oC

CC

■

HIGHNOISEIMMUNITY:
V

NIH=VNIL

■ 50Ω TRANSMISSIONLINEDRIVING

=28%VCC(MIN.)

=4ns (TYP.)atVCC=5V

PD

CAPABILITY

■ SYMMETRICALOUTPUTIMPEDANCE:

|I

|=IOL=24mA(MIN)

OH

■ BALANCEDPROPAGATIONDELAYS:

t

≅ t

PLH

PHL

■

OPERATINGVOLTAGERANGE:
V

(OPR)= 2Vto6V

CC

■ PINANDFUNCTIONCOMPATIBLEWITH

74SERIES280

■ IMPROVEDLATCH-UPIMMUNITY

DESCRIPTION

The AC280 is an advanced high-speed CMOS 9
BIT PARITY GENERATOR fabricated with
sub-micron silicon gate and double-layer metal
wiring C

2

MOS technology. It is ideal for low
power applications mantaining high speed
operation similar to equivalent Bipolar Schottky
TTL.
It is composed of nine data inputs (A to I) and

B

(PlasticPackage)

(Micro Package)

M

ORDERCODES :

74AC280B 74AC280M

odd/evenparity outputs (ΣODD andΣEVEN).The
nine data inputs control the output conditions.
When the number of high level input is odd,

Σ

ODD outputis kept high andΣEVEN outputlow.
Conservely, when the output is even, ΣEVEN
output is kept highand ΣODD low.

The IC generates either odd or even parity
makingit flexibleapplication.

The word-length capability is easily expanded by
cascading.

All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.

PIN CONNECTION AND IEC LOGICSYMBOLS

December 1998

1/8

74AC280

INPUT AND OUTPUTEQUIVALENTCIRCUIT

TRUTH TABLE

NUMBER OF INPUT S A THRU I THAT ARE HIG H OUT P UT

0, 2, 4, 6, 8 H L
1, 3, 5, 7, 9 L H

LOGICDIAGRAM

PIN DESCRIPTION

PI N No SYMB OL NAME AND FUNCT I O N

5, 6

8, 9, 10, 11,
12, 13, 1, 2,

4
3 NC No Connection

7 GND Ground (0V)

14 V

EVEN

Σ

ΣODD

A toI Data Inputs

CC

EVEN

Σ

Parity Outputs

Positive Supply Voltage

Σ

ODD

2/8

74AC280

ABSOLUTE MAXIMUM RATINGS

Symb o l Para met er Val u e Uni t

V

V

V

I

I

OK

I

or I

I

CC

T

T

AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamageto thedevicemayoccur.Functionaloperationunderthesecondition isnotimplied.

RECOMMENDED OPERATING CONDITIONS

Symb o l Para met er Value Un it

V

V

V

T

dt/dv Input Rise and Fall Time V

1)VINfrom30%to70%of V

Supply Voltage -0.5 to +7 V

CC

DC Input Voltage -0.5 to VCC+ 0.5 V

I

DC Output Voltage -0.5 to VCC+ 0.5 V

O

DC Input Diode Current ± 20 mA

IK

DC Output Diode Current ± 20 mA
DC Output Current

O

DC VCCor Ground Current

GND

Storage Temperature -65 to +150

stg

Lead Temperature (10 sec) 300

L

Supply Voltage 2 to 6 V

CC

Input Voltage 0 to V

I

Output Voltage 0 to V

O

Operating Temperature: -40 to +85

op

= 3.0, 4.5 or 5.5 V(note 1) 8 ns/V

CC

CC

50 mA

±

200 mA

±

CC
CC

o

C

o

C

V
V

o

C

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